<template>
  <div>
    <!-- 面包屑区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert title="注意:只允许第三级分类设置相关参数!" type="warning" :closable="false" show-icon>
        </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
              :options="catelist"
              :props="cateProps"
              v-model="selectedCateKeys"
              @change="handleChange" clearable>
            </el-cascader>
        </el-col>
      </el-row>
      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
          <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" :disabled="isBtnDisable" @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">
                {{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button icon="el-icon-edit" type="primary" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button icon="el-icon-delete" type="danger" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
          </el-tab-pane>
          <!-- 添加静态参数面板 -->
          <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" :disabled="isBtnDisable" @click="addDialogVisible = true">添加属性</el-button>
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClosed(i,scope.row)">
                {{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button icon="el-icon-edit" type="primary" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button icon="el-icon-delete" type="danger" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
          </el-tab-pane>
        </el-tabs>
    </el-card>
    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%" @close="addDialogClosed">
      <!-- 内容 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
        </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="50%" @close="editDialogClosed">
      <!-- 内容 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
        </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 指定联级选择器的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 联级选择器双向绑定
      selectedCateKeys: [],
      // 被激活的页签名字
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态参数数据
      onlyTableData: [],
      // 控制添加的显示和隐藏
      addDialogVisible: false,
      // 添加参数的表单数据
      addForm: {
        attr_name: ''
      },
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 控制修改的显示和隐藏
      editDialogVisible: false,
      // 修改参数的表单数据
      editForm: {
        attr_name: ''
      },
      // 修改的规则
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data
      // console.log(this.catelist)
    },
    // 联级选择器发生变化触发该事件
    handleChange() {
      this.getParamsData()
    },
    // tab页签点击事件处理函数
    handleTabClick() {
      // console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      console.log(this.selectedCateKeys)
      // 证明是不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 根据所选的id，和当前的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName }
        })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数失败')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        // 控制文本框和按钮的显示与隐藏
        item.inputVisible = false
        // 文本框里的值
        item.inputValue = ''
      })
      console.log(res.data)
      // 判断是动态还是静态数据
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      }
      this.onlyTableData = res.data
    },
    // 监听添加参数对话框关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击确认，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        // 发起修改的请求
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数失败成功！')
        this.getParamsData()
        this.addDialogVisible = false
      })
    },
    // 显示参数修改对话框,查询参数信息
    async showEditDialog(id) {
      // console.log(this.scope.row.id)
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`,
        { params: { attr_sel: this.activeName }
        })
      if (res.meta.status !== 200) {
        return this.$message.error('查询参数信息失败！')
      }
      // 把获取到的参数信息对象，保存到 编辑表单数据对象中
      this.editForm = res.data
      // console.log(this.editForm)
      this.editDialogVisible = true
    },
    // 监听修改参数对话框关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 监听修改参数提交
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        // 发起修改的请求
        // console.log(this.editCate)
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('编辑参数信息失败！')
        }
        this.$message.success('编辑参数信息成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据id删除参数
    async removeParams(id) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 如果参数确认删除，则返回值为字符串 confirm
      // 如果参数取消删除，则返回值为字符串 cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
      if (res.meta.status !== 200) return this.$message.error('删除参数失败！')
      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 文本框失去焦点，或者按了回车
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有 return，说明输入了内容，需要后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 发起请求，保存操作
      this.saveAttrVals(row)
    },
    // 将对attr_vals的操作，保存到数据库
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(',')
        })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数信息失败！')
      }
      this.$message.success('修改参数信息成功！')
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // $nextTick 方法的作用，就是当页面上元素被重新渲染后，
      // 才会指定调用函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    handleClosed(i, row) {
      row.attr_vals.splice(i, 1)
      // 保存
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用返回true，反之则false
    isBtnDisable() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
  .cat_opt {
    margin: 15px 0;
  }
  .el-tag {
    margin: 10px;
  }
  .input-new-tag {
    width: 120px;
  }
</style>
